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A web application is particularly susceptible to these problems, because it relies on basic HTML input controls that don t have all the features of their Windows counterparts. For example, a common technique in a Windows application is to handle the KeyPress event of a text box, check to see whether the current character is valid, and prevent it from appearing if it isn t. This technique makes it easy to create a text box that accepts only numeric input. In web applications, however, you don t have that sort of fine-grained control. To handle a KeyPress event, the page would have to be posted back to the server every time the user types a letter, which would slow down the application hopelessly. Instead, you need to perform all your validation at once when a page (which may contain multiple input controls) is submitted. You then need to create the appropriate user interface to report the mistakes. Some websites report only the first incorrect field, while others use a table, list, or window to describe them all. By the time you ve perfected your validation strategy, you ll have spent a considerable amount of effort writing tedious code. ASP .NET aims to save you this trouble and provide you with a reusable framework of validation controls that manages validation details by checking fields and reporting on errors automatically. These controls can even use client-side JavaScript to provide a more dynamic and responsive interface while still providing ordinary validation for older browsers (often referred to as down-level browsers).

ASP.NET provides five validator controls, which are described in Table 10-1. Four are targeted at specific types of validation, while the fifth allows you to apply custom validation routines. You ll also see a ValidationSummary control in the Toolbox, which gives you another option for showing a list of validation error messages in one place. You ll learn about the ValidationSummary later in this chapter (see the Other Display Options section). Table 10-1. Validator Controls

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Now that you have a web application that serves up XML, you need a program to import the data into Access. For this example, you ll use the DBI database library for Ruby, mentioned earlier in the chapter. DBI comes with the Ruby one-click installer, but in order to get DBI to work with ActiveX Data Objects (ADO), you ll need to install the ADO driver. (ADO is one of many Microsoft technologies for accessing databases.) Create a directory called C:\ruby\lib\ruby\site_ruby\X.Y\DBD\ADO. Replace X.Y with the appropriate Ruby version, and if your Ruby isn t installed in C:\ruby, modify the path appropriately). Grab the latest Ruby-DBI package from http://rubyforge.org/projects/ ruby-dbi (you ll need at least version 0.1.1), and unzip the file src/lib/dbd_ado/ADO.rb into that directory. You ll need an appropriate decompression utility to unzip the tar.gz file, such as 7-Zip (http://www.7-zip.org/). Of course, the ability to insert data into the database isn t enough, You also need to be able to retrieve the XML from the server and parse it. Let s use XmlSimple. As you saw in 9, XmlSimple is a very simple XML parser designed to turn complex XML data into a collection of hashes and arrays. (It s based on the Perl XML::Simple library, so if you ve used that, it will be familiar.) You ll also need to install the rubyscript2exe gem. Install both gems as follows:

Validation succeeds as long as the input control doesn t contain an empty string. Validation succeeds if the input control contains a value within a specific numeric, alphabetic, or date range. Validation succeeds if the input control contains a value that matches the value in another input control, or a fixed value that you specify. Validation succeeds if the value in an input control matches a specified regular expression. Validation is performed by a user-defined function.

Compared to AOP, which maybe left your brain hurting a little bit as you tried to grasp its core concepts, dependency injection (DI) is a relatively simple concept You can probably find some more in-depth explanations describing DI, but it basically boils down to this: Have you ever written EJB 2x style beans and had to use JNDI lookups to obtain an instance of the EJB from container You have to create an instance of the InitialContext object and then use the lookup method to obtain an instance of the desired bean If you re using local EJBs, you then only have to cast the result of the lookup to the correct type If you re using remote EJBs, then you have the additional step of calling PortableRemoteObject narrow to finish accessing the bean.

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